Variables with underscores don't work in array length match syntax

A variable whose name contains an underscore will not properly parse in an array length match expression.

    Scenario: varbs
      * def arr = ['a','b','c','d','e']
      * match arr == "#[5]"
      * def two = 2
      * def three = 3
      * match arr == "#[two+three]"
      * def t_wo = 2
      # fails
      * match arr == "#[t_wo+three]"

The last test fails with error:

match failed: EQUALS
$ | actual array length is 5 (LIST:STRING)
  ["a","b","c","d","e"]
  '#[t_wo+three]'

[ptrthomas]

@aimanfatima great job ! thanks for your help and contributing 👍

[ptrthomas]

1.3.0 released